Macbook Pro runs hot

I have an i5 2.53 15" Macbook Pro and it runs a lot hotter than my old core 2duo. I have it on my lap for around 20mins and it burns. Is it a normal problem or something i should bring to the Genius Bar?
BTW i swap in my old 256 ocz vertex from my old MBP, not sure if that is the reason why it runs so hot

Smcfancontrol will do a good job. You can try increase the fan rpm but its going to be some noise . A question, there's no ventilation in macbook Unibody. Where does the heat escape? if the fan keeps blowing inner body. Heat transfers out aluminum body easily but it wont be efficient without ventilation.

Running with the screen opened too far can lower air flow and create more heat build up. Running with the screen closed can do the same thing because almost all the hot air goes up between the screen and keyboard... best to run it with the screen near to straight up.